Stencil duplicating machine



March 29, 1938 I A. F. KAP-TULLER I 2,112,338

STENCIL DUPLICATING MACHINE Filed Aug. 29, 1956 3 Sheets-Sh9et lfiwezzzix QQ/em/me/IF 0 March 1938- v A. F. KAPTULLER 2,

STENCIL DUPLICATING MACHINE Filed Aug. 29, 1956 3 Sheets-Sheet 2 March 29, 1938. A KAPTULLER 2,112,338

STENCIL DUPLICA'IING MACHINE Filei'Aug. 29 19:56 3 sheets-sheet a a6 52 37 1 Patented Mar. 29, 1938 UNITED STATES 2,112,338 STENCIL DUPLICATING MACHINE Alexander F. Kaptuller, Chicago, 111., assignor to speed o-Print Corporation, Chicago, 111., a corporation oflllinois Application August 29, 1936', Serial No. 98,564 '1 Claims. (01. wig-11s) Tl'iistinvention relatesto improvements in a stencil duplicating machine.

The: object of this invention is to provide a 'machin'ewhich is of simple and rugged construction and has a minimum number of parts. It is so oonstructedlthat the various portions may be readily disassembled .for. cleaning of adjustment and reassembled; with. ease, without requiring mechanical ability;

1.0 Another object of this invention is to provide asi-mple, rapidandpositive means for securing the ink padvand stencil in vplace on the drum.

Another object is to provide simple and improved mea'nsfor removably journaling the sten- 15. oil carrying. drum so that it may readily be cleaned or changedtwhen' usingdifferent colors of ink;

Afurther object is to provide an improved means .for removably journaling the impression 2o rollenand'for adjusting the impression roller to;

accommodate varying thicknesses of paper.

Other objects relate to various features and economy of construction and arrangement of parts which will be apparent from a considera- 25 tion of the following specification, wherein;

Figure 1 is a perspective view of the complete machine.-

Figure 2 is" a .detail in perspective showing one endof the impression roller removably journaled 30 in its adjustment'lever.

Figure 3 is a detail insection of the impression roller adjustment rod and thumb nut.

Figure! is arvertical section through the center'of'the machine.

5 Figure 5" is a plan view of the machine, with part of the drum andfeed table broken away.

Figure .6 is a transverse section of the machine viewedcfrom its delivery end with certain parts broken away and others completed for the pur- 4'0 pose of clearness andv showing a longitudinal section of the drum.

Figure 7- is a transverse section of the drum, and

Figure 8 is a. detail in perspective of a shaft 55 end sleeve bearing and retaining ring.

Referring to the drawings, the machine comprises side frame 10 having a feed table II pro vided with a guide I2 laterally adjusted in slots l3. A tray I4 may be loosely inserted at the de- 50 livery end. The stencil carrying drum I5 is demountably journaled in the slots [6 extending into the side framev members, preferably in the manner andpoint. shown. A hand crank l'l may be providedkfor manually rotating the drum.

55 Extending from the drum l.5- are'itsshafts' I8 which carry the sleeve bearings l9. When a hand crank is used as shown in-the drawings it serves to lock one of the sleeve bearings in place. The other end of the shaft, or both ends, may be provided with annular grooves into which-are '5;- seated bearing retaining rings 2|. As willbe shown later, I use the same system of sleeve bearlugs and retaining rings on the shafts of theimpression roller.

To demountably lock the bearings IS in the 10 slots 16, I provide clamp levers 22, preferably pivoted to'the inner sides of the frame as at 23. "The clamps are provided with a crotched portion 24' adapted for peripheral engagement with the bearings, in register with the slots l6, and have 15 thumb pieces 25 at one end. Extending from some suitable part of the machine tothe lower ends of the clamp levers are the springs 26 which give tension to the clamps to hold them looked over the bearings. It will thus be seen that in order to mount or demount the drum itis only necessary to draw back the clamps by means of their thumb pieces, so that the crot'clied portion is out of register with the slot. Suitable stop members 21 may be provided so as to prevent 5 the thumb pieces from descending below the edge of the frame.

The stencil mounting drum has the usual perforated segment, at one end of which is a slide rod 28 for engaging one end of the ink pad and g studs 29 for engaging one end of the stencil. Pivoted to the inside of the heads of. the drum at 3B and 3!, are the curved spring arms 32 and 33 which carry the clamping bars or ball like clamp members 34 and 35. A bar or preferg5 ably a flange 36 extends inwardly from one edge of the segmentand is longitudinally groovedi as' at 3'! and then extends backwardly at right angles to form another bar 38. The ink pad when mounted passes over the flange 36 and is clamped 46 between the bar 38 and the bail which clamps it in place. The stencil is thenmounted and passes over the flange 36 where it is clamped by the bail 34 which snaps into the groove 31. It will thus be seen that the action of the ball carried by its spring arms holds both the pad and stencil firmly in place and has a further tendency to draw them smoothly around the segment; the whole operation being simple and capable of be-'- ing readily and rapidly performed. Stop studs 39 and 43 may be provided to limit the movement of the bail arms 33.

The impression roller 4| has shafts 42 carrying sleeve bearings 19' which are locked on by retaining rings 2| set into annular grooves'i2ll"; 5"

in the same manner as the drum shafts. Extending between the sides of the frame is the rocker bar 43 carrying the levers 44 which pivot on it. Secured between the lower ends of the levers 44 is the bar 45. The other end of the lever which extends substantially horizontally, but preferably slightly downwardly from its pivot, is bifurcated or slotted as at 46 to journal the roller 4|. Pivoted beyond the slotted portion as at 41 are the clamp levers 48. These clamps are provided with a crotched portion 49 adapted for peripheral engagement with the bearings I9, in register with the slots 46, by means of the spring 50, and terminate in finger pieces It will thus be seen that by depressing the finger pieces 5| the roller may be mounted or demounted, and yet may be firmly journaled when in use.

It will be seen from the drawings that my preferred form of clamps 48 are of double construe-- tion, formed of a single piece extending on both sides of the slot. This prevents their lateral displacement, results in a firmer lock, and the lower connecting portion forms a stop to prevent Vertical displacement when the roller is demounted.

,Secured to a suitable point on the frame as at 52 are the springs 53 which extend under tension to engage the bar 45 adjacent the levers 44 and tend to swing the levers about the rocker arm .43 and thereby urge the impression roller into peripheral engagement with the drum. The bar 45 may be offset at its center at which point it may be engaged by a loop or eye formed at one end of the adjustment rod 54, as shown in the drawings, or by any other suitable means of operative connection. The other end of the rod 54 is threaded and extends through the end apron of the feed table through opening 55 where it is engaged and retained by the thumb nut 56. A washer 58, preferably of rubber to act as a cushion, is provided between the nut and apron.

It will thus be seen that by manipulating the thumb nut 56, the adjusting rod 54 causes the levers 42 to rock on their pivots or rocker arm 43 and'thereby to vary the degree of peripheral engagement between the roller and the drum, so that varying thicknesses of paper may be used or the degree of impression varied. After the desired engagement is obtained, the thumb nut may be set by the lock nut 51. The thumb nut 56 has a reduced body portion 59 which fits into the opening 55 and acts as a bushing. The roller may also be held out of engagement with the drum by means of this bushing, for the purpose of freely rotating the drum, ease in demounting the drum or roller, or any other such purpose. This is accomplished by grasping thumb nut 56 and withdrawing its bushing portion from the opening 55, and then tilting it off center so that it engages the apron where it is held due to the tension of spring 53. AlthoughI have shown and described certain features of my improvements for the purpose of illustration, it will be apparent to one skilled in the art that various changes may be made in the details and form of construction without departing, from the spirit of my invention, and therefore, I do not wish to be restricted specifically thereto except as so limited by the appended claims.

What I claim is:

1. In a stencil duplicating machine, rotatable members comprising a drum and an impression roller, shafts extending from said members, sleeve bearings on said shafts, annular grooves adjacent the ends of said shafts, and bearing retaining rings positioned in said grooves.

2. In a stencil duplicating machine, side frames, a drum journaled therein, levers pivoted adjacent said side frames and carrying an impression roller, spring means for holding said roller in yieldable peripheral engagement with said drum, a tie rod extending between said levers, an adjustment rod engaged to said tie rod at right angles thereto, and means carried by said adjustment rod for both varying the peripheral engagement of said impression roller with said drum and to retain it out of engagement therewith.

3. In a stencil duplicating machine, side frames, a feed table, an end apron extending from said feed table, a drum mounted in said side frames, leversv pivoted adjacent said side frames, an impression roller carried by said levers, spring means for holding said roller in yieldable engagement with said drum, a tie rod extending between said levers, an adjustment rod engaged to said tie rod and having a threaded end extending through said apron, and a nut for engaging said end and adapted to vary the peripheral engagement of said roller with said drum and to hold it out of engagement therewith.

4. In a stencil duplicating machine, side frames, a feed table, an end apron extending from said feed table, a drum mounted in said side frames, a rod extending between said side frames, bell crank levers pivotally mounted on said rod, an impression roller carried by one pair of arms of said levers and a tie rod extending between the other arms thereof, spring means for holding said roller in yieldable engagement with said drum, an adjustment rod engaged to said tie rod at right angles thereto andhaving a threaded end extending through said apron, a shouldered nut adapted for variable abutting engagement against said apron for engaging said threaded end and adapted to vary the peripheral engagement of said roller with said drum and to hold it out of engagement therewith.

5. In a stencil duplicating machine, a drum, shafts extending therefrom, bearing members on said shafts, side frames having slots adapted to receive said bearings, clamps pivoted adjacent said slots and adapted to engage said bearings, an impression roller, shafts extending from said roller, bearings on said shafts, bifurcated levers adapted to receive said bearings, clamps pivoted to said levers and adapted to engage said bearings, spring means acting on said levers for yieldably holding said roller in peripheral engagement with said drum, and means cooperating with said levers to vary the peripheral engagement of said roller with said drum and to hold the roller out of engagement therewith.

6. In a stencil duplicating machine, side frames having slots therein, clamps pivoted adjacent said slots, a drum adapted to be mounted in said slots and demountably retained therein by said clamps, crank levers positioned adjacent said side frames and having a bifurcated arm, clamps pivoted to said arms, an impression roller adapted to be mounted on said bifurcated arms and demountably retained thereinby said clamps, a tie rod extending between the other arms of said levers, spring means for holding said roller in yieldable engagement with said drum, and an adjustment rod engaged to said tie rod and adapted to vary the peripheral engagement of said roller with said drum and to hold item of engagement therewith. I

'7. In a stencil duplicating machine, side frames, a feed table, an end apron extending from said feed table, slots in said side frames, crotched clamps pivoted adjacent said slots, a drum having shafts extending therefrom, bearings on said shafts adapted to be received in said slots and demountably retained therein by said clamps, a rocker arm extending between said side frames and carrying crank levers, slots in one pair of arms of said levers, crotched clamps pivoted on said arms, an impression roller having shafts extending therefrom, bearings on said shafts adapt ed to be received by said slotted arms and demo'untably retained therein by said clamps, a tie rod extending between the other arms of said levers, spring means adapted to retain said roller in peripheral engagement with said drum, an. adjustment rod engaged to said tie rod and having a threaded end extending through an opening in saidapron, a nut adapted to engage said threaded end and to advance and retract said adjustment rod.

ALEXANDER F KAPTULLER. 

